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Hone the cam bearing bores? #815821
09/27/10 01:50 PM 09/27/10 01:50 PM
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
dart_73_br Offline OP
mopar
dart_73_br  Offline OP
mopar

Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
Hello guys,

I'm trying to help a friend. He's preparing his LA block and having some issues with the cam bores.

I can see something similar in this MM Mike's blog.
http://www.musclemotorsracing.com/muscle-mike-blog/82-the-real-reason-my-cam-wont-turn.html


I think he will need to hone the cam bearing bores but he can't find oversize cam bearings. Do you know if this is available or if there's any other option?


Thanks,
Re: Hone the cam bearing bores? [Re: dart_73_br] #815822
09/27/10 02:06 PM 09/27/10 02:06 PM
Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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blownzoom440 Offline
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ELYRIA,OH
good subject.

Re: Hone the cam bearing bores? [Re: blownzoom440] #815823
09/27/10 03:03 PM 09/27/10 03:03 PM
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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HotRodDave Offline
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I think typically the reason they need to be honed is they are not installed properly, also I think they scrape the bearings not the bores. I had that problem one time and was told by several people to just scrape the bearings, I wasn't gonna do it so I pulled all the bearings back out, ran a wire brush on a drill through all the bores so they were super cleanand was VERY carefull to get them all in there straight and I could twirl the cam with two fingers. I do know of at least one motor where they just scraped the bearings to get clearance and the guy has been driving it daily for 4 years with no issue

I am not causing global warming, I am just trying to hold off a impending Ice Age!
Re: Hone the cam bearing bores? [Re: dart_73_br] #815824
09/27/10 05:13 PM 09/27/10 05:13 PM
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Cab_Burge Offline
I Win
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Bend,OR USA
Mopar is famous for not getting the cam bores the correct I.D. I have scraped many cam bearings, one at a time, to get the cams to install properly. If you don't have a cam bearing tool take the block to someone who does and remove all of them but the rear one, install the cam in it annd see if it will rotae easily or not. If not look at the tight spots, they shine and scrape the shine off with a BEARING KNIFE, do not try to hone it Once that is fixed mmove to the next one, do one at a time until there all done One of the machine shops that I use to used in SO CA used a brake hone to hone the block cam holes(journals to the proper size and then install new standard cam bearings. I don't live close to them anymore so I have to do it myself (scrape method) now EDITED for content, sorry for rushing earlier IHTMSN

Last edited by Cab_Burge; 09/27/10 10:42 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Hone the cam bearing bores? [Re: Cab_Burge] #815825
09/27/10 06:27 PM 09/27/10 06:27 PM
Joined: Aug 2004
Posts: 2,128
sweden
S
sshemi Offline
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sweden
I have a fix to this problem that i have tried on several motors.

Take an old cam and cut (i did it with an anglegrinder with cutoff wheel) grooves on every bearing journal along the cam. this will make it cut the bearings. use some fine sandpaper to smooth the journals. install cam with oil and turn a few turns.
I promise it will work.
Re: Hone the cam bearing bores? [Re: sshemi] #815826
09/27/10 06:37 PM 09/27/10 06:37 PM
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
dart_73_br Offline OP
mopar
dart_73_br  Offline OP
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Sao Paulo, Brazil
Ok guys! So far so good.

One thing.. he complains that the block part of the journal... where we install the bearing doesn't have a good finishing. Has some burr.. and doesn't have a rectified finish.

That's why he wanted to hone it... but as I look there's no oversized cam bearing.. I mean if there was any outter diameter oversized he could do that... but I havefound just for chevys.

Anybody knows it for mopars?

BR//
Re: Hone the cam bearing bores? [Re: sshemi] #815827
09/27/10 07:33 PM 09/27/10 07:33 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Quote:

I have a fix to this problem that i have tried on several motors.

Take an old cam and cut (i did it with an anglegrinder with cutoff wheel) grooves on every bearing journal along the cam. this will make it cut the bearings. use some fine sandpaper to smooth the journals. install cam with oil and turn a few turns.
I promise it will work.



This is all I do.... I cut a old cam for this purpose
Re: Hone the cam bearing bores? [Re: MR_P_BODY] #815828
09/27/10 10:24 PM 09/27/10 10:24 PM
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
dart_73_br Offline OP
mopar
dart_73_br  Offline OP
mopar

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Posts: 637
Sao Paulo, Brazil
Ok, is like a groove in the middle of the cam journals?
Re: Hone the cam bearing bores? [Re: dart_73_br] #815829
09/27/10 10:45 PM 09/27/10 10:45 PM
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Cab_Burge Offline
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Quote:

Ok, is like a groove in the middle of the cam journals?

No, use a file or whatever you want and cut the cam juornals front to rear to make the cut smooth the bearing out I've never done it that way but many on here do

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Hone the cam bearing bores? [Re: dart_73_br] #815830
09/27/10 10:56 PM 09/27/10 10:56 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Quote:

Ok, is like a groove in the middle of the cam journals?



I cut a groove in each cam journal... I used a .040 thick
cut off wheel... slip it in and give it a few turns
Re: Hone the cam bearing bores? [Re: MR_P_BODY] #815831
09/27/10 10:58 PM 09/27/10 10:58 PM
Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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blownzoom440 Offline
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Quote:

Quote:

Ok, is like a groove in the middle of the cam journals?



I cut a groove in each cam journal... I used a .040 thick
cut off wheel... slip it in and give it a few turns



dont you have to worry about peeling off a whole layer or making it thin?
Re: Hone the cam bearing bores? [Re: blownzoom440] #815832
09/27/10 11:35 PM 09/27/10 11:35 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
Quote:

Quote:

Quote:

Ok, is like a groove in the middle of the cam journals?



I cut a groove in each cam journal... I used a .040 thick
cut off wheel... slip it in and give it a few turns



dont you have to worry about peeling off a whole layer or making it thin?



Nope it just cuts any tight spots... being that its
a full cam its in there straight... and I've never
had a cam bearing problem doing it this way
Re: Hone the cam bearing bores? [Re: MR_P_BODY] #815833
09/28/10 01:30 AM 09/28/10 01:30 AM
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
dart_73_br Offline OP
mopar
dart_73_br  Offline OP
mopar

Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
Good idea doods!

I'll do that!
Re: Hone the cam bearing bores? [Re: dart_73_br] #815834
10/02/10 07:55 PM 10/02/10 07:55 PM
Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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blownzoom440 Offline
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ELYRIA,OH
the fit of the cam is important.let us know how things go.you dont want any problems by forcing the cam in.i may have extensive wear on my cam from tight barings.i have to measure yet.

6229511-100_5037.jpg (391 downloads)
Re: Hone the cam bearing bores? [Re: MR_P_BODY] #815835
10/02/10 08:17 PM 10/02/10 08:17 PM
Joined: Nov 2004
Posts: 6,890
North Alabama
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Monte_Smith Offline
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North Alabama
Quote:

Quote:

Ok, is like a groove in the middle of the cam journals?



I cut a groove in each cam journal... I used a .040 thick
cut off wheel... slip it in and give it a few turns


It's called a "cutter cam" and many machine shops have been doing it this way for years. Is it the "absolute" right way to do it, not really, but the "right" way generally gets to be expensive and not really neded in 90% of applications.

Monte
Re: Hone the cam bearing bores? [Re: Monte_Smith] #815836
10/03/10 12:03 AM 10/03/10 12:03 AM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
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Az
Quote:

Quote:

Quote:

Ok, is like a groove in the middle of the cam journals?



I cut a groove in each cam journal... I used a .040 thick
cut off wheel... slip it in and give it a few turns


It's called a "cutter cam" and many machine shops have been doing it this way for years. Is it the "absolute" right way to do it, not really, but the "right" way generally gets to be expensive and not really neded in 90% of applications.

Monte

A quality machine shop will do this automatically as part of the cam bearing install proceedure.

Fastest 300
Re: Hone the cam bearing bores? [Re: Crizila] #815837
10/03/10 12:06 AM 10/03/10 12:06 AM
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Sport440 Offline
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Sport440  Offline
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Posts: 6,591
Canton, Ohio
Quote:

Quote:

Quote:

Quote:

Ok, is like a groove in the middle of the cam journals?



I cut a groove in each cam journal... I used a .040 thick
cut off wheel... slip it in and give it a few turns


It's called a "cutter cam" and many machine shops have been doing it this way for years. Is it the "absolute" right way to do it, not really, but the "right" way generally gets to be expensive and not really neded in 90% of applications.

Monte

A quality machine shop will do this automatically as part of the cam bearing install proceedure.



Its the way I do it in my garage!

I guess now, it Qualifies as a Quality Machine shop. mike
Re: Hone the cam bearing bores? [Re: Sport440] #815838
10/03/10 12:41 AM 10/03/10 12:41 AM
Joined: Oct 2007
Posts: 846
Illinois
moparmattkos Offline
mopar addict
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Joined: Oct 2007
Posts: 846
Illinois
When cutting a old cam do you cut the groove all the way around the old cam or just partialy? Can you post up a pic of the cam you did this to?

www.sikosracing.net Heads up Drag racing
Re: Hone the cam bearing bores? [Re: moparmattkos] #815839
10/03/10 01:40 AM 10/03/10 01:40 AM
Joined: Sep 2005
Posts: 1,202
California
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polkat Offline
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You cut across the came journals, from front to back. I like to cut them on a slight angle. A hacksaw works fine (but takes a while).

The slotted cam may not want to go in right away with new bearings, so I made a little handle I can bolt to the nose of the cam. I put the cam in as far as it will go, and turn it slowly as I lightly push the cam further in. The slotted journals cut their way in nicely.
Re: Hone the cam bearing bores? [Re: polkat] #815840
10/03/10 12:31 PM 10/03/10 12:31 PM
Joined: Aug 2004
Posts: 2,128
sweden
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sshemi Offline
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sweden
use lots of oil while doing it.
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